A new multifunctional fluorenyl carbazole hybrid for high performance deep blue fluorescence, orange phosphorescent host and fluorescence/phosphorescence white OLEDs

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• 作者：Chuan Wu^a ; ^b ; Silu Tao^a ; ^{silutao@uestc.edu.cn} ; Mingming Chen^a ; Hin-Wai Mo^b ; Tsz Wai Ng^b ; Xiaoke Liu^c ; ^d ; Xiaohong Zhang^c ; ^d ; Weiming Zhao^e ; Chun-Sing Lee^b ; ^{apcslee@cityu.edu.hk}
• 关键词：Organic light-emitting devices ; Deep blue emission ; Multifunctional molecule
• 刊名：Dyes and Pigments
• 出版年：2013
• 出版时间：May, 2013
• 年：2013
• 卷：97
• 期：2
• 页码：273-277
• 全文大小：514 K

文摘

A new multifunctional host material, 3,3¡ä-(2,7-di(quinolin-8-yl)-9H-fluorene-9,9-diyl)bis(9-phenyl-9H-carbazole) has been designed, synthesized and used in high performance OLEDs. This tetrasubstituted fluorene was found to have good morphological and thermal stability with a high glass transition temperature of 192 ¡ãC and a decomposition temperature of 480 ¡ãC. A non-doped tri-layer blue fluorescent device based on this tetrasubstituted fluorene shows a deep blue emission with a Commission Internationale de L¡¯Eclairage coordinates of (0.16, 0.10) and a maximum power efficiency of 1.1 lm/W. An orange phosphorescent device using this tetrasubstituted fluorene as a host in conjunction with an iridium complex as dopant exhibits a maximum power efficiency of 21.0 lm/W, which is much higher than that of a biscarbazolylbiphenyl-based control device (11.5 lm/W) with the same device structure. Furthermore, by using the tetrasubstituted fluorene as a blue florescent emitter and a host for phosphorescent dopant, a white emitting OLED with a maximum power efficiency of 22.5 lm/W and CIE coordinates of (0.38, 0.33) were obtained. These results show that this tetrasubstituted fluorene is a versatile multifunctional material for OLED applications.